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The agency is currently seeking to delay the final shuttle flight to Feb. 28, 2011.

该机构正在试图将最后一次的航天飞机飞行时间定在2011年2月28日。

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The mission is NASA's 132nd space shuttle flight since the fleet began launching into space in April 1981.

自1981年4月首次进入太空以来，本次任务是NASA航天飞机的第132次太空飞行。

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NASA plans to retire the shuttle fleet, bringing US manned space flight to an end, for the forseeable future.

VOA: standard.2010.04.15

NASA officials cleared the flight after technicians fixed a hydrogen leak in the shuttle's fueling system, which delayed the launch from last week.

VOA: standard.2009.03.15

In fact, there had been evidence of leakage, what the engineers called "blowby, " on an earlier shuttle flight.

NPR: Challenger: Reporting a Disaster's Cold, Hard Facts

Ms. Ride was slated for a third shuttle flight when the Challenger exploded after taking off in 1986.

WSJ: Sally Ride, First U.S. Woman in Space, Dies

There was not going to be a Shuttle flight to fix this problem.

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